2 files changed, 31 insertions, 9 deletions

diff --git a/sci2jslex.py b/sci2jslex.py
index 931a7e12..83eadeab 100755
--- a/sci2jslex.py
+++ b/sci2jslex.py
@@ -64,7 +64,8 @@ tokens = [
     'NUMBER',
     'OPENBRACKET',
     'OPENSQBRACKET',
-    'OPERATOR',
+    'MULTIPLICATION',
+    'ADDITION',
     'PREVAR',
     'QSTRING',
     'SEMICOLON',
@@ -86,7 +87,7 @@ def t_COMMENT(t):
     pass
 
 def t_NUMBER(t):
-    r'-?(\d+(\.\d*)?|\.\d+)([eE][+-]?\d+)?'
+    r'(\d+(\.\d*)?|\.\d+)([eE][+-]?\d+)?'
     global afterarray
     afterarray = False
     t.state = 'NUMBER'
@@ -135,11 +136,18 @@ def t_DOT(t):
     t.state = 'DOT'
     return t
 
-def t_OPERATOR(t):
-    r'[+\-*/^\\]'
+def t_MULTIPLICATION(t):
+    r'[*/^\\]'
     global afterarray
     afterarray = False
-    t.state = 'OPERATOR'
+    t.state = 'MULTIPLICATION'
+    return t
+
+def t_ADDITION(t):
+    r'[+\-]'
+    global afterarray
+    afterarray = False
+    t.state = 'ADDITION'
     return t
 
 def t_COMMA(t):
diff --git a/sci2jsyacc.py b/sci2jsyacc.py
index 77b7e050..e174aa20 100755
--- a/sci2jsyacc.py
+++ b/sci2jsyacc.py
@@ -5,6 +5,12 @@ import ply.yacc as yacc
 
 from sci2jslex import tokens
 
+precedence = (
+    ('left', 'ADDITION'),
+    ('left', 'MULTIPLICATION'),
+    ('right', 'UNARYADDITION'),
+)
+
 start = 'statementblock'
 
 # define statementblock
@@ -66,8 +72,8 @@ def p_termarraylist_termarraylist_semicolon_expression(p):
     p[0] = str(p[1]) + ',' + str(p[3])
 
 def p_termarraylist_termarraylist_expression(p):
-    '''termarraylist : termarraylist expression
-                     | expression expression'''
+    '''termarraylist : termarraylist term
+                     | term term'''
     p[0] = str(p[1]) + ',' + str(p[2])
 
 # end define termarraylist
@@ -87,10 +93,18 @@ def p_expression_term_transpose(p):
     'expression : term TRANSPOSE'
     p[0] = 'transpose(' + str(p[1]) + ')'
 
-def p_expression_operator_term(p):
-    'expression : expression OPERATOR term'
+def p_expression_expression_multiplication_expression(p):
+    'expression : expression MULTIPLICATION expression'
+    p[0] = str(p[1]) + str(p[2]) + str(p[3])
+
+def p_expression_expression_addition_expression(p):
+    'expression : expression ADDITION expression'
     p[0] = str(p[1]) + str(p[2]) + str(p[3])
 
+def p_expression_addition_term(p):
+    'expression : ADDITION term %prec UNARYADDITION'
+    p[0] = str(p[1]) + str(p[2])
+
 def p_expression_term(p):
     'expression : term'
     p[0] = str(p[1])